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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef7042fe23b7ef49cc0d983a8eacd52a78aff22ed57400682d148fb422396ee' 
  AND token = 'xCeaXgVxDz1zG5PGkDsWbFECD9CRXvFDveVd2WFJ7QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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