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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd9a9bc71227013609b163c04aa9814d9cc3146d0068eb925fc3377b1fb47c8' 
  AND token = 'YL+uEbhQCNTLH0xEVYddYjYRg+06KqTL1ZXb3UWkaOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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