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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e24558e0ebb6c0f4af1cd31f2d526ac07d9c59927e8cbcf60d9e51ee8fc9c91' 
  AND token = 'd1Ofuw6XM1SyvHFnqFKU1o8GjvTgheWVl1FGkQumFBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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