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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797b3244e006a6eb964a8448d766395b7ba407b64907f6196194f2200007da54' 
  AND token = '8hGo7C/ukf8nyK6HUCUtyf084PEYUBMsJnOyBVCEU8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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