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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09922502570fb22c3bb3005657af1e0ecfbf807ed2bc094592817527651dfadf' 
  AND token = 'QWpTxVF5Fb3L0ZOwZTx+txvkgEoIOpD+3peOWFzgjKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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