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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92f2e5e837396e85ed78d458c32f9717aa4fe495af3388ea40632041e5691b1' 
  AND token = '3/Wt9GueKTUDOVDhzitxFWpAI/TOZz2xE+6MKGMFxgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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