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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0619318d5ef11b89f6a4d938e9f432324ff2e0e18c41e0e8abf9ab7a0ad7e003' 
  AND token = 'K2J9QAznmuYkrPUXYkWUbDPQohpLDv1nxFbxneZlP4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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