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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f1744d5b8db7cdde8323b494879252ccef553ba9839f77a2f2cb500260c63f' 
  AND token = 'GR63kAEood/x7mDbn4R9nOhlSxJQqi545CkdIbOXDNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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