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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c44c9ad2c00d4af054d9fb43674ab0163c3b6fa7d8ebd077353b7ca0393ee5a' 
  AND token = 'h4p/efgh52Amx4gXUFF4QC8TCvg2igmfKtCMAaJnVLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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