SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1843bc22344a97bfbcb47cc39fe530f998128195607b52e08a63da81fa4469d9' 
  AND token = 'gOIHpfW/b47rK8vnF4ggOWh280ZLvQqHodY4rPdJvSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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