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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fc869f36ab84c98c9e0d58f8a3c4ae5d663fc2443c59afe541c6409c49ccb3' 
  AND token = 'AFnQGGq0PmwCCxBH7SK9iYk9IpGRrmFi4oCXVX6gMys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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