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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d8c559b892aa8daaec1d0b872979aa2191d9cc423b062af41a00e6cdda5e3c' 
  AND token = '/b+7yXiwVx4QIbAHnarhl3bRmIGMaAQWagSkgpQyq7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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