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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a66612d2e43ad3d46a5ccc9f6e1bf9fe08c0c55661c75bb7082bf15c2e303bb' 
  AND token = 'LGJ+RbAPGpQRy07Y+sw2Nq8iYK7Q+Hix6GLdK6Fp0xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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