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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458263cb2313541650f1b269c4da36031526cff7af4cd1e30c90135ace3c0b2a' 
  AND token = '7sSkLaK1CqpYqi/Hq5dvSyjHW9ncCIngmlmq9cVcAXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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