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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04eb59515e928a44eec95fce7e96db86302d8fba79f7a4c7dce44d8f2bcff66c' 
  AND token = 'JiUeXgaWLGbNAQHQ02Efwvc4l+l6BqFTfKtCdQl6VRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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