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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1add6c985a41616491896b6e2b242bfbae53cf978867ffb549fe1700a92e2de0' 
  AND token = '4jJboF9peeEbx/AB3u+Tw4euHIC3bJLmt6w2jC8NPR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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