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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9229bda8da4104b3c42dac210d0620499625167c75799171e347163ccc59f6' 
  AND token = 'Km5y/iIjZzjm5y2VQkaotUj3csvX42CP7f77MkXmKpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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