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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61320fe9267bd1719be1c692b2074c3a344b628ef0b7dd49727d913a4d8b8d45' 
  AND token = 'Zqtcw6cMczsh6ZO9bUThyb5EUgtCJEtXqVYUy2IuYww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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