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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac9fea5e7d7653ff5cbcde241f58f9eedf0487ade21c5cc4c4f619d85c05bf1' 
  AND token = 'VnV51UbjR94Kl9N6hj6K1X+0jjztHd/+ZMMdVAv0Fio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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