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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca9b94fbe25ff11472f55881395e2893f04a6e69fba24ba34f729231d499c28' 
  AND token = 'ek/06pWwUhP5/tEFFAgkHs4xzRPoH9A7o70Rc8Zd+wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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