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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ca9c355bdbb67520690501f45eb0ec929ea32ee8976005d9e28c9cfba90553' 
  AND token = 'VKJqleIFyD9ltxYsOzTwZ2kWPtIKgp2DuBb5E1gHFI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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