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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6eb3826e4398efb83ef9e173bd4b366fe96ee24aae46933fad1011944ebc9c' 
  AND token = 'X4e2S4qp9tS4cFAAunJzAfXSTmIX12Gtis2EGAi9JUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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