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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f79a239103f53ad6c2fd0315b01a8a82f833dab0c227891875d5da179a5fa01' 
  AND token = 'mOlcv3PjSP1cZkBEke0BuiXHPF5YnsTQVAIZmTTtEqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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