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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0058027ccfc6af344fe8b9a79005bca71a3583566cd2b1d4d6bb0e056b8a0791' 
  AND token = 'NmxOuJvhtPAf9ZhCBG22ns/b550sfF39uXfEwd91+gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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