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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ba772a99ff0e75c9d2f46784a3c7591ba94f77d0da2900fb6f255b5e5b4f63' 
  AND token = 'IbfnPzJbD5C8NafDgHLTN3O6mLIWfYT/3sePwZJND9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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