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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f4fd015210bac0e4a310991e1b5bb1063f6b7dc46cf9d31e6365623e967542' 
  AND token = '2LacEcqnX12ed8mOOSe3hDuM5ybQqA5FBP2Skuhfwc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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