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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e368bdc7fbac7834f6222c79b7c6b40f3dccd22e2b5efc13ee47a207ed8b754' 
  AND token = 'OX0EggAHhrJZe/AVAKO/5o3d5W4+hRPg/b0TtYr4BOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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