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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe30a9a9d68e7a5593f275e0d3139fcd3052de8746ff47ab17b8744cc8debe8' 
  AND token = '4yM0qR2348Swb2o89wAf0waQAi15dn1mWp3L0/4e6Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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