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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03d12cda4ba60b95ce3297c3ebd0b4799ff4f63a41c0505858f19ae0d8e3594' 
  AND token = 'Rm5DnWFm7BTLByZr2o1bUAXhvjouQke6hHTkMbbt7CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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