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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b9632b61df2de2f2e08b0bf85804beac69fdae3563f21142af5cda7d409305' 
  AND token = 'UTgcrG1pog597I6WKAF11Rskhbj/j4x3nZUn97Sc7T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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