SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2192bc27a9e1db4677d0db0cf0c8341a41c219ec3a7ee16184b28f3759eb60' 
  AND token = 'R/ht5PvafBh2wDz9DyqUQU/FykoKZwo/gl7DTkISTGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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