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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ddf2612c560c1a908cd8d74ee2237857da6b333cecbad9d5808bda9dde43fe7' 
  AND token = 'C07nI9uEkhII4rlRM9KAzgsD77+fx3gwhEvKOWmfGVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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