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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3636aaaab8fe112bfee1f7f7d30d6c8d647639c812f509b845cb7e5af3ce740' 
  AND token = 'yQ57udXL80JiFIadARYDgxiDxPtUi9c1xTEH3CXxiZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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