SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4106bf378f66978f380359f0338cde0cf7aa21aa5885e0c969714690c5b90c18' 
  AND token = 'JMbdjJTBKL+Xu/hYASJV/lA26wmf5lffWEwDM8Dyglw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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