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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393db787e748434c8167f3c51fe4a599ab369d35a57bbdfefd7c70a8538c9d4b' 
  AND token = 'IAFFBGFaEE9W8aTCQTSbt6FMsxqy83XdL820QdoGJNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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