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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3140bb80a17e37af49005ded398118c8880c1ad76ea4ed903afb211c44a555' 
  AND token = 'ioEAtT9vCNOoCZZBv1ZWCUtgjshNubVdge2zM3SEb9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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