SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8322f10990af6bdc7ea10203fb45699b80526f0f204ca9d45d642937110d87' 
  AND token = 'breeLE/Hm6V3UfP0Jj6OHH+ZBc/TUVB5SEhQUvg+CuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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