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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c83cd1bc0cbd2d6486ec8fbd11373ce33db7b36baf47ac2f0ccd56d6a3eb59' 
  AND token = 'dVrl4EmDOIXb71M81pIl+mT/ecYqIbJrmmFr3d/Z01g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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