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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89194c96e334cdf1f07cc19214cc3c5b598b62a804b66ad76d51e5f0ce48569' 
  AND token = 'Ow53ZJEy/PqJcHmhFBhCt89LAsR9pi//FZGkT5B1kD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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