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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da67cff25f3fa30d111f3bb47382face89d9846d5606ed0e39e5f26ebd08dbf8' 
  AND token = 'kMlp91ILTkc9D7lv5FBtzhviBzGCqIeqJRFLF6Ng4x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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