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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4594a858d9680fd06f07b59e6b7b8fbefee03caef4aaa106ba2695d50eb39b' 
  AND token = '5fU0MCYTvazLz0n8UYHbXe5eTMazruytMi6ZtRFLQV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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