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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a7b267b0f8603d275717b5f3fde4cdc29359a212588e02bee71c268e42c4b9' 
  AND token = 'KL49bkcTIW+7ZzrC1fOXecqP0Zmt+pm/Z6sIWKhJF+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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