SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2287aef986d7ff0850b8d647110a3d38c265c66c059daed3cd101fba27c2d182' 
  AND token = 'KKWIqchpoK6vfBwjRd8J4WU+d8sTSCQZNXUmmwNwPgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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