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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d811e89c19ee9a18c0cc32f4a0271fcfc4ee10cae1ebe9254bec21d4cccf5c3' 
  AND token = 'Yh0ZXJeEtmEZMlh7loRL0xsEY2HlmmKVirjMJ7/+qso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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