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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79f075d0a88e946bece8f95c7d7a428d166082300f6c0299e7872d08221facb' 
  AND token = 'Ol5EYq/YPVHGu2uHM5cxNBTQewVC6UoFY//YnD7ZHtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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