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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '375041076f1fb015c2320abf43f78f2c8e902cada9738f4be449d75736ed7969' 
  AND token = 'qoreCSZeyFFBbeNoeobqINdG5carTUllS9e/9eoUkiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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