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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403c62a358c10d401373c9696de8de4eb906aa95061b3b7222d77a2d772e034a' 
  AND token = '2wjv8i8IMz5Q5Chb6w61+7WoYl/pwbPxWSDYiGv/sFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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