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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02dfd450b3d414bb5910ad5b891e7ac3ce30534ea7ab405d7331c2f0f95c0da' 
  AND token = 'eBcYGkZgmCSH+5GAQYGM1zv3u+a5Gupub1V7Oc5+Yhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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