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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd012fd2e5956b1859972c076b6c9ab8c55c38582c026ea960e5803457b8ffd0f' 
  AND token = 'z0JzYRkcbtM/ydao/0VYy0AWb48wBVFQJdx0zhGjvFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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