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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55199bc7b0e9ccf0ca5cb94fdc35d101bd26b21c89beba903e5501088217e37' 
  AND token = 'IVJ8lBTKK40wgJacJSAED17LV1NsSiCRm4rpJT7bREM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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