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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef044bbd37e39a10796f0d4a68df65b61e6715685c795c66707503bb1f18255f' 
  AND token = 'XNYYapuV75G50m1F5OLUGMc+tbTtvfp4UEegyAO1glE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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