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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de23e24462ed89f1d51d7be2249d46db0fc66c7920d1855f64f81d39ce84c3a' 
  AND token = 'D+UkEo9ABPq1NcyK2ofQhGU17bea/QlXR7QaL6Zm/r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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