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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a23579192701a56d3507a8dfe2a2dad912967c4dc958c8db8a0837c05034804' 
  AND token = 'eSgqKrRejRDAcUDu0jt1Uw6ae/T6xbdrg+s57Apyr8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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