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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a4890c765c788739dc854e44e905b29fbdc26cc271b1a963536819cef028de' 
  AND token = '98doFI497xlSbdZD1ZokZfUcF8zNEEsz6RbpppaLszs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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