SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9158883275c4da06f774b4df123128a00a161da2f875fd746ad6f51f833d7b' 
  AND token = 'RDKOseP6ZUEQuYjhZIav6suV5o2GKzhDkOQe+hzoFkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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