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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101ddb6c0179838fb9b6215b98699d9bef6f8a4cb6a40e6f4a77de484202a810' 
  AND token = 'XObgQNuMpYXk8Sb7n63DPdxZd7G7awj6WhQaCQx/CPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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