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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60cef9f20c8e781fa890c3e809eafe5d8ae6f5658473f46eb0dac36cb772eb67' 
  AND token = 'aUHn874JC805/eCoobGVF7mzD4cYF163mw1aX/MzEHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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