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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272f1487118456c9f3b9818bf9d3faff6a72a6834b3f668947d6d3878a5330e0' 
  AND token = '3sVoRzrAgMKga5ag/WgTaWk1D/GWuhrzf9C0NyobV7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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