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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ed912d2f78dcd03cac30a6758496be3ab344b51fa696f7277c0a3a3b95ce7b' 
  AND token = 'golo6f4XJy1mg81zrUeS8jLzkcLsHIj6oDAQxwnZ+Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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