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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1574d40d7d1e1c0eb9fe41c0df6f8ec3e28a53d58e048b1850fe7dee16316c' 
  AND token = 'l2cC/2dALkMyqbaWd/PkCbexH0HogVI1wd7tXIqhu4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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