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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365b1fde843b67e8aafd89bc6faa5e394c823e01fa8653f6b221151bbf31c97a' 
  AND token = '8HyAUTvn0H75Yk31oLsNAad3sjWrdKGwso5qQIifUEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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