SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac20b862b043a591ef115862e49018914c5e376737c616b2239c27f873a41f9' 
  AND token = 'YRBqo/B/mqpFoqxsGK/6430jbZ9Y42gAtS6Vk1s7Zfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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