SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb863e47d5a2d3b5b59520a53614b009780a69298902074f173843f96b5fd33d' 
  AND token = '+Vjk5HoxypOo/TSZwGHj/h+Z4/CSJpcAZXNXS+jbn0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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