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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfcf97240aafe5cf8d4886d4cd3a392d25e813166a00f850219d623de618412' 
  AND token = 'jzMZ9/pN8O+RuWYy6UTR9s38BhnNwsDS8JsncTQGlmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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