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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bc4121dfd24f058f7323cd87f7c1316fc8386a5dca784f65c030da05613810' 
  AND token = '5vSVspaVtBm7PCpgFc+N+C1RvkUmxma6B6VxqkQYXII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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