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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5f91f3fb67e058f290a30eeecdd4d5b07f1e7288cd688cc8589cb620ffe67e' 
  AND token = 'Zj3eFGPbteNc7HR/M/5p1SAmRXyLaI1eKwrE0WpFgOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}