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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfca3b671384f01e3a756ddc46c6f8e17d1cd416e19c93134aefc02c21ffcc5c' 
  AND token = 'tAy5k3u4PljzF15WVJTtSp8KCcGoXlPoP8CGZnuSz7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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