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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f7189e12a91da4afd21c549e0ee3d445cfa8226ee5f0007cdd54d5998722ea' 
  AND token = 'YCUV0nswpuoTqAWjK4FEcC6f3tg/q2zRjkzLPLWjj4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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