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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026aab82674dbaaaf5efa5440810263ea0e0ca7cea621a7bf5535ebd0b6d9e5f' 
  AND token = 'I+/f3bZ1hlPKo/I6OlI7wTngzN46UMg+VUK9DW4XkGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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