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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d9057b4d81ecd9fb53dd6f2cda63b35c2b917e306c7d20f25762826459c883' 
  AND token = 'K9uHLgxX6Gysl3V9C7yE0Y3iHakigUKDIrHof8pY3RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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