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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d94f12cc1df982a7911510db736a21b071044e94762c746d0486e81023881b0' 
  AND token = 'EsN9jf29RFbIcFR55rPp0ZJkOu0nUt0EJSgsDsKWh3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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