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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d230d52b8ee9f5bb54e1ebadd7263530ca5383c5aefa19f5cd494f17bb700a7' 
  AND token = 'k4bq0cMEkn0qFV9O50gmdWxIRNUvjIjq2+CSymR46ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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