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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b8e9ce231b1b3306a4a79ded5990388f2aa8687ef735ec752a71b4e6660929' 
  AND token = '9tYSy9dcrXVpvYBmjzjil37HnZxmWhYss2kj7x0JiVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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