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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03b84c7d2850b11dda292a0511d9b68ccbbceae014d01d14643d7f98a61f844' 
  AND token = 'lBsE8jJ7SMl8rhrSKJ3alRyaa/OvUSA5aYmlrfK3HT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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